Watlow F4T User Manual

Watlow F4T • 159 • Chapter 5 Function Reference
Scale High
Set the value of input X at which the Range High setting is the desired result of scaling. Scale
High and Range High are the coordinates of a point on the line that relates input X to the
scaled output.
Range: -99,999.000 to 99,999.000
Units
Set the source units.
Options:
• Source: when SW is on, the output has the same units as input X. When SW is off, the
output has the same units as input B.
• None: the output value is a pure number without units
• Absolute Temperature: the output value is a temperature value on the Celsius or Fahr-
enheit scale. For example, 33° F as an absolute temperature is one degree above the
freezing point of water. An absolute temperature can be used as a set point or com-
pared with other temperatures to determine which is hotter or colder.
• Relative Temperature: the output is a value is a relative number of degrees, not an
absolute temperature. For example, the difference between the two measured tem-
peratures, 120° C and 100° C is 20 degrees, but it is not the temperature 20° C. A rela-
tive temperature is appropriate for use as a calibration offset or a deviation alarm set
point.
• Power: the output value is a percentage signal where 100% represents full power and
0% represents no power.
• Process: the output is in units of measure other than degrees Fahrenheit, degrees Cel-
sius or relative humidity.
• Relative Humidity: the output is in percent relative humidity (%RH).
Range Low
Set the desired result of scaling at the point where input X equals the Scale Low setting.
Scale Low and Range Low are the coordinates of a point on the line that relates input X to the
scaled output.
Range: -99,999.000 to 99,999.000
Range High
Set the desired result of scaling at the point where input X equals the Scale High setting.
Scale High and Range High are the coordinates of a point on the line that relates input X to
the scaled output.
Range: -99,999.000 to 99,999.000
Offset
Adjustment added to the result of the calculation.
Range: -99,999.000 to 99,999.000

Watlow F4T Specifications

General

Inputs	Thermocouple, RTD, mA, V
Outputs	Relay, SSR, mA, V
Communication	Ethernet, Modbus RTU
Data Logging	Yes
Certifications	CE, UL, cUL, RoHS
Control Modes	PID, On/Off
Power Supply	100 to 240 VAC
Operating Temperature	0 to 50°C
Enclosure Rating	IP65
Display	4.3 in. (109 mm) color touch panel LCD
Control Loops	Up to 4